Sigh...
Sorry for a less perverse and more morally sound option, but just have fun. I mean, when my parents are gone, I play Gears of War without having to worry about Mom getting all grossed out from the gore. I play Final Fantasy without the inevitable interruption during important cutscenes. I watch anime without being lectured about whether or not I got all my homework done. Not to mention I can turn it all up really, really high.
Don't use the time to screw up your life, just enjoy the benefits of their absence.